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      <title>28亿年后地球成死地，人类必须在太阳系外殖民</title>
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      <description>28亿年后地球就会变成一片死地，这远早于太阳变成白矮星的70亿年 太阳目前处于稳定中年期，但核心温度升高已使表面温度上升、半径增大、亮度增强。人类若等到太阳系末日才行动，早已失去窗口。 天体物理学给出的时间线远比标题中“50亿年”更紧迫。太阳要70亿年后才会演化成白矮星，而地球生态崩</description>
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